HSBC downgraded Trade Desk (TTD) to reduce from hold while adjusting its price target to $20 from $31.

Shares of Trade Desk were down 7.2%, with intraday trading volume at more than 12.6 million, compared with the stock's daily average of about 20.8 million.

BNP Paribas adjusted the price target for Zoetis (ZTS) shares to $146 from $185, following the company's Q1 results late last week.

Shares of Zoetis dropped 7.5%, with intraday trading volume at over 7.94 million, compared with a daily average of about 4.61 million.

Certara (CERT) reported Q1 adjusted earnings below market expectations on Monday, while sales rose moderately from a year ago.

Shares slumped 20% as intraday trading volume catapulted to more than 3.99 million from a daily average of about 3.67 million.

Price: 21.33, Change: -1.73, Percent Change: -7.50